90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Klara, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* This file is #included by gzip.c */
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static off_t
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unzstd(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
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{
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static char *ibuf, *obuf;
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ZSTD_inBuffer zib;
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ZSTD_outBuffer zob;
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ZSTD_DCtx *zds;
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ssize_t res;
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size_t zres;
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size_t bytes_out = 0;
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int eof = 0;
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if (ibuf == NULL)
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ibuf = malloc(BUFLEN);
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if (obuf == NULL)
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obuf = malloc(BUFLEN);
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if (ibuf == NULL || obuf == NULL)
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maybe_err("malloc");
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zds = ZSTD_createDStream();
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ZSTD_initDStream(zds);
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zib.src = pre;
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zib.size = prelen;
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zib.pos = 0;
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if (bytes_in != NULL)
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*bytes_in = prelen;
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zob.dst = obuf;
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zob.size = BUFLEN;
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zob.pos = 0;
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while (!eof) {
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if (zib.pos >= zib.size) {
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res = read(in, ibuf, BUFLEN);
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if (res < 0)
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maybe_err("read");
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if (res == 0)
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eof = 1;
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infile_newdata(res);
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zib.src = ibuf;
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zib.size = res;
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zib.pos = 0;
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if (bytes_in != NULL)
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*bytes_in += res;
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}
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zres = ZSTD_decompressStream(zds, &zob, &zib);
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if (ZSTD_isError(zres)) {
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maybe_errx("%s", ZSTD_getErrorName(zres));
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}
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if (zob.pos > 0) {
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res = write(out, obuf, zob.pos);
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if (res < 0)
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maybe_err("write");
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zob.pos = 0;
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bytes_out += res;
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}
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}
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ZSTD_freeDStream(zds);
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return (bytes_out);
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}
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